Change of Nutrition and Fertilization Effect in Brown Soil

The effects of no fertilization on soil nutrients and crop yield in brown soil in Tangyin County were studied.The result of long-term location test showed that without fertilization the content of soil nutrients declined obviously such as organic matter,total N,alkalytic N,available P and available K,and as time went on,it declined at more degree.The yield of wheat and corn was reduced greatly,production of no fertilization was steady when reaching certain year.